"Even if this feeling important to me disappears...I'll feel this way about you again."

Syaoran first appears as an antagonist in the story, capturing a few cards for himself in the anime. His initial attitude towards her was cold, critical, and socially awkward, to the extent of never even addressing her by her first name until the third season, and often criticized her bluntly for her flaws and clumsiness. He was also portrayed as somewhat of a loner, given that he had been taught to be independent and self-reliant since childhood. However, as the series progresses, and especially after Sakura is officially deemed the new mistress of the Cards, Syaoran drops his rivalistic attitude towards her, and becomes a reliable ally and a beloved friend.

Otaku Trivia:

1) A major change to Syaoran's character in Cardcaptors involves elevating Li Syaoran to become the male lead character, rather than a supporting character for Sakura in Cardcaptor Sakura. Here, Li is also referred to as a Cardcaptor, while he has no such title in the original series, as Cerberus never selected him, and he has no initial ability to seal cards for himself.

2) Syaoran's favorite color is green.

3) Syaoran's name (meaning "little wolf") sounds similar to Shao Long, "little dragon", which is one of famous Bruce Lee's given names (李小龍, pinyin: Lǐ Xiǎolóng, often romanized as Lee Shao Long).